<container>
  <row>
    <columns small="12" large="12">
      <button href="#" class="hollow">Default Hollow</button>
      <button href="#" class="hollow round secondary">Secondary Hollow</button>
      <button href="#" class="hollow radius success">Success Hollow</button>
      <button href="#" class="hollow warning">Warning Hollow</button>
      <button href="#" class="hollow alert expanded">Alert Hollow</button>
    </columns>
  </row>
</container>
